Attachment-plug for electric wires.



` c. P. TUREN. ATTACHMENT PLUG. EUR ELECTRIC WIRES.

APPLICATION FILED SEPTJS', |916.

1,248,421. Pand Nov. 27, 1917r A i! l IIIIIIII i WTNESSES I framers `parts in the cuantas nummer Tonen',

or SPRINGFIELD,ianssacnusii'r'ra Assieivoaor ons;

FIFTH .fro woiireiuve ii. 'scHWAnzMeNm or LoNsMEA'DoW, mAssAcnUsE'rrs; I

To. all'whom it may concern:

'Be `it known that I, CHAnmis Ff ToiuN, a

citizen 'of the United States, and a resident ofdS ringfield, inthe county of Hampden .6 an

tate of Massachusetts, have invented a new and Improved Attachment-Plug lfor Electric Wires, of which lthe following isa full clear, and exact description.

This invention relates to electrical appliances and has particular reference to vattachment means fr electric extension devices or the like.

The prima ob`ect of the invention'is to provide a p ug for extension wires, lamps or other electrical appliances ad operate with a screw threaded `standard socket, the connection being made by a sim ple push or plunge of the `plug Vinto the socket. f.

'Another object of the invention `is to imlprove the construction ofV extension plugs with respectto the means-for securin t e extension wires thereto, providing or a direct pull upon y the wires for releasing-the plug, without any danger of breakage or disconnectionof the wires. f i

With the foregoing and other objects"V in view, the invention consists in the arrangement and combinationof parts hereinafter $0 described and claimed, and while the invention is not restricted to the Aexact details of construction disclosed or su gested herein, still for the purposeof i lustrating a practical embodiment thereof referenceis like Vreference characters `designate, the same several views, and in which- Figure'l s a vertical sectionallview of a therein;` i Fig.` 22is a vertical longitudinal section of my improved plug .on the line 2-'4-2'of Fig. 1"; Fig. iis. en end; view of 'the plug as seen on thelinej3f3 ofgFg, 2; Fig. 4' is a'transver'se section onfthe' line of Figa; ,and Fig. `5 ',i's a plan view "of the inner end ef the.p1ug yc"cr`eg;y

Referring now T'inore` particularly" to the drawings, I show iii Fig. 1 a standard socket y10 having a threaded contact'cup 11 with metallic connection in the usual waywith a wire A. Said socket also hasa center con,- ytact. 12 with metallic connection .with the ATTACHMENTlPLUG FOB. ELECTRIC WIRES.

specification uf Leners rainf.-

' the edge -inner or nad to the accompanying drawings,in lwhich socket lhaving my' improved 'plug secured wire B. These parts are?? may be, of conventional. nature and I refer to them only to make clear the operatiomof my new devices. 1 i

Patented Nov. 27, 1917. applicati@ nieiivsepiemiieriaisie, .semina 119,544..

My improved plug is shown as apoleat 13 and; comprises a core 14 of porcelain or other suitable insulation. ,15 indicates a center contact pin having. at its outer end a rigid metallic head 16lying within a recess 17 in the end .of the'core. A metal contact 18, adaptedto engage the center contact .12 of the socket, is slidably fitted over the head 16 `and has its inner edge vspun thereover, as shown at 19, to prevent separation of the contact 18 from the center pin. A spring 2Oy acting outwardly upon the contact insures. proper engagementI with the, contact 12, but permits' inward movementl of the resilient.` contact, V

, The base portion of the plug comprises an inner sleeve 21 havin a flange-'22 at4 its inner end lying in a p ane perpendicular to the axis o f the plug and having atjits outer end a .flange 23 having a down tur-ned margin 24. The metal base portion of the plug also includes an outersleeve 2 5, indicated as split into three similar longitudinal sections.

Each section ofthis sleeve comprises an in` wardlyprojectingflange 26 at its inner end anda longitudinally extended lip 27at its outer end. The flange 26lies u on the flange 22. of thesleeve 21 and the lip 2 lies between -24 and theV mai..l-p0 l'tion of the awhole is .screw threaded to simulate `the threading of the socket 11, and hence in the main correspondsto theusual extension plug or lamp base electrically considered;

by one or more s rin fixed sleeve 21 an acting outwardly .on the sleever 25 sleeve 25 being limited by the rim I251 at end.'v and the sleeve 29 fat; the other; The

Each'- part of the sleeve; 25 ,is, actedupon" 28 carried. .by the the.` outward.V movement ofi the one sleeve 21;.is fixed rigidlyupon the core and theirotationxof the split sleeve 251s prevent- :ed-by lugs 30 struck. outwardlyv4 from Vthe aange 22,.-andi lugs, 31 4struck inwardly .,frmm..y theflange-.23i-...The lugs 30 and 31 project radially between adjacent A.members .of the sleeve 25, and not only .prevent rotation of the Vsleeve 25. as a whole, but serve V'also to keep each .section of the sleeve in proper position.

outwardly i 1.y The herein I The 4sleeve 25 is connected by late 40,

rivet 41 and a binding post 32 Wit a wire A and the centercontact pin 15 is electris cally connected through a'plate 33 andbind- The cap has ai. central huh 39 which servesn to grip these v vires snugly against the adjacent end of the core, independently of the electrical connections at 32 and 34, thereby relieving all strain which maybe put upon the wires from the binding fpostf.. The sleeve '29 being fastened by means of a rivet 41 to the inner end 'of the c'ore and thecap 38 being screwed firmly thereon, the wires will be amply bound in the lace indicated for all practical pu :"ooses.y vince this plug is adapted particularly for use in connection with lamp sockets having shades and making access to the plug inconvenient for manipulation,` it is intended that the removal of the plugmay be effected simply by drawing or jerking upon the Wires.

To connect 'the plug to the socket,- all the operator has to do. is to simply thrust or shove the base portion thereof directly into the socket. The round outer end of the sleeve 25 will 'ride easily' over the threads ofthe socket piece and the springs .28" will permit' sufficient inward radial movement of the portions of the sleeve 25 to enable the crests of' these'portions to ride over the crests 'of the member 11. The contact piece 18 will-thus be brought into proper engagement with the center contact 12, completing the electrical connections. The coperating threads of the two main parts will serve in the usual `Way vto hold the parts together, but while the springs 28 are sufficiently stron to thus hold the parts together, they wil permit the'withdrawal of the plug by direct pull thereon throng manufactured and put on themarket at a low. cost.'

I claim:

described attachment 'plug comprising a core, a center contact in secured therein, a resilient contact s idably connected. tothe vouter end ofthe pin, a pair of Sleeves fitted around-the core," one of the sleeves' being fixed 'and the other comprising of radially movable aeg-itionsi,` resilient vmeans tendingnto' 'force the sections .carried thereby" h thevvres. This device' is comparatively'smiple and is Vthoroughly practical and reliable in use and may be.

v with respect to .the fixed s1eeve, anda pairof electrical'contacts connected Withsaid center pin and said sleeve members. n 2. In an attachment' plug, tli'e"'combina tion of a', core of insulation, .i center contact a `contabt sleeve surroundinsulated therebyffrrnn the ing the core and center contact, said sleeve comprising a plurffrty of independently radially 'movable sections, means to prevent .cifcumfe fentia.1 movement or dlsplacement of any o these sections, a pair of entension Wires means to electrically connect the Wires respectively to the sleeve and the' center contact, and means independent of the connectingmeans afore said to clamp said Wires. to the end ofthe core to relieve. said electrical "connections, of the Wires from strain".

3.v In arl-attachment pluj'gj'of the character set forth, the combina-tion of a core o' insu.- lation, a center'f contact pin' fitted tn vrein, e pair 'of sleeves surrounding the core, one ci? the sleeves being' fixed in position thereon and having inner and outer end flanges, the other sleeve comprising a plurality off-inde pendently movable 'sectimsr having their Aends fitted -for movement along said flanges,

means to limit the movement of thesections substantially to radial movement with respect to the core, and electric terminals connected' respectively to. said cent-eiU pin and sleeve structure. y

4. In an attachment plug, the comhination of a 'core having-a cavity inits outer end, fa fixed center contact pin extending 'through the ore and having a rigidly con nected metal ic head= located in said cavity, a resilient contact slidably fitted to head and projectingr beyond the core, contact sleeve devices surrounding the core. and insulated thereby from the center pin and its contact, and a pair of electric terminals associated respectively with the pin and said sleeve devices. l

5. In an attachment plug of the character ice set-forth, the combination of a core of insiillation, a centerv contact carried thereby, a fixed sleeve surroundingthe core and'fhavv-r ing end fianges projecting outwardly thereu from in parallel planes perpendicular to the axis ofthe core, each'of the. fianges having a' series of vlugs projecting toward the other iange, lan outer sleeve comprising a plurality of independent sections movable toward or from a fixed sleeve, each dsection having its'ends lyingbetvveen adjacent angel'ugs,

said section belng-held from 'circumferential movement' by sai-d lues, means tending to force the sleeve septions outwardly, vmeans tric terminals associated 'respectively with -to -limit-said outward "movemenhfand, electhecenter contact" and said sleeve; structure.r

' oHaiiLE's .rn-truien TQR'N. 

